Question

(1) (b) concrete, (c) polyethylene, or (d) water? 1.14 Copper is generally considered easy to weld because of its high thermal conductivity: (a) true or (b) false? (1) 1,15 Which of the following properties or characteristics do not apply to metals (two correct answers): (a) good thermal conductivity, (b) high strength, (c) high electrical resistivity, (d) high stiffness, and (e) ionic bonding? 1.16 An alloy is a metal composed of two or more elements, at least one of which is metallic. The two main categories of alloys are which two of the following: (a) alloids, (b) intermediate phases, (c) metal compounds, (d) phase solutions, and (2) (e) solid solutions? (2) 1.17 A eutectic alloy is which of the following (two correct answers): (a) the composition in an alloy system at which the two elements are present in equal proportions, (b) the composition in an alloy system for which the solidus and liquidus are at different temperatures, (c) the composition in an alloy system for which the solidus and liquidus are at the same temperature, (d) the composition in an alloy system that has the highest melting point, and (e) the composition in an alloy system that has the lowest melting point? (2) 1.18 A steel with 1.0 % carbon is known as which one of the following: (a) eutectoid, (b) hypoeutectoid, (c) hypereutectoid, or (d) wrought iron? (1) 1.19 A ceramic material can be defined as an organic compound consisting of a metal or semimetal and one or more nonmetals: (a) true or (b) false?? (1)

Answer 1

Soli (1114) 'False . Coppes is generally difficult to weld ecause its High thermal conductivity. It allows heat to be conducted from . energy source into work too rapidly inhibiting heat buildup for melting at joint (1.15) Correct options are a (c) Ligh electrical Resistivity. (e) Jonic Bonding Metals are good conductor of electricity, so it's electrical Resistivity is low Jonic bonds are formed between a cation, which is usually a metal, and an anion, which is usually nonmetal. (146) Connect options are :- . (b) Intermediate Phases @ ) solid Solution Intermediate phase es defined as the phase, whose chemical composition are intermediate between two pure metals. R A solid solution is a solid state solution of one or more solutes in a solvent.

(+) Correct Options are :- The composition in an alloy system for which the solidus and liquidus are at different temparatures.. The composition is an alloy system that has the highest melting point (d) (1.58) Correct Ans:- (C) Hyperele fectoid :- It is having - more than 0.6% of 'C' contact Wheads hypo eutectoid has less the oby. of 'C'. (119) True - A team cenamic is an inorganic compound, consisting of a metal (or semi metal) and one or a more non metals.